All good questions Jim. I haven't a clew, although, I suspect YOU will move faster if you Pizz on the helmsman.Stream flow for sure.
1) If you are standing on the fore deck and Pizz on the unfurled head sail, does the boat move faster?
2) Pizz overboard instead, does the boat move faster?
3) Pizz on the helmsman, does the boat move faster?
Jim...
-Will (Dragonfly)